Methods of making polysiloxanes

Details Methods of making polysiloxanes Methods of making polysiloxanes

1995-09-18

1996-09-10

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 31, C08G 7708

Patent

active

055547087

ABSTRACT:
Linear or straight-chain trimethylsiloxy endcapped methylhydrogen polysiloxanes are made by contacting hexamethyldisiloxane with a highly pure methylhydrogen cyclic siloxane, in the presence of anhydrous trifluoromethane sulfonic acid catalyst at room temperature. Trimethylsiloxy endcapped alkylmethyl siloxanes are made by reacting the linear or straight-chain trimethylsiloxy endcapped methylhydrogen polysiloxanes with an alpha-olefin, in the presence of a platinum catalyst. Alkylmethyl cyclic siloxanes containing zero parts per million residual .tbd.SiH, are made by reacting anhydrous alpha-olefins and a highly pure methylhydrogen cyclic siloxane, in the presence of dried platinum supported on carbon catalyst.

REFERENCES:
patent: 5247116 (1993-09-01), Buese et al.
patent: 5281657 (1994-01-01), Mautner et al.
patent: 5408026 (1995-04-01), Cowan

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